What is the most common clinical presentation of a chalazion?

A chalazion is a lipogranulomatous inflammation of a meibomian gland that often occurs when the gland becomes blocked, leading to the accumulation of secretions and subsequent swelling. The most common clinical presentation is indeed swelling on the eyelid. This swelling, which can vary in size, usually appears as a firm, non-tender lump and may cause discomfort but is often not painful.

While other symptoms, like pain and redness, can occur, they are not as universally present in cases of chalazion as the observable swelling itself. Itchiness and watery eyes are more commonly associated with other eye conditions, such as conjunctivitis or allergies, rather than specifically a chalazion. Photophobia typically reflects irritation or inflammation but is not specifically linked to the presence of a chalazion. Therefore, the key indicator is the swelling on the eyelid, which is the hallmark presentation for this condition.